LEM DX 24 User manual

11
11
1
Index
Soldering point.
Male connector.
Female connector.
M/F faston connector.
Test point.
Supply voltage. Logic supply ground.
Analog supply ground.
Chassis ground.
Earth ground.
Flag joined with one or more flags
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12
Phone [phone] - Fax [phone] - Internet: www.generalmusic.com
Technical Specification, Assembly.2
Test Procedure & Wiring/Block Diagram,.3
Controls Panel Board Schematic.
6Cpu/Dsp & AD/DA Pcb Layout.
4
Cpu/Dsp & AD/DA Board, In/Out Board Schematics.5
8Spare Part List.
In/Out & Controls Panel Pcb Layouts.7
with the same signal name inscribed.
ATTENTION Observe precautions when handling electrostatic sensitive devices.
Notice
Service must be carried out by qualified personnel only. Any tampering carried out by unqualified personnel during the guarantee period
will forfeit the right to guarantee.
For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.
To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.
All components marked by this symbol have special safety characteristics, when replacing any of these components use only
manufacturer's specified parts.
The (µ) micro symbol of capacitance value is substituted by U.
The (
Ω ) omega symbol of resistance value is substituted by E.
The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.
All resistors are 1/8W unless otherwise specified.
All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.
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☎
®
SERVICE MANUAL
code 270252
DX24

22
22
2
768245 727620
110285 110614
768231
768226 768243 768244 731011
Connectors
2 x XLR-F
Nominal input sensitivity
0dBu (0.775V
RMS
)
Input Impedance
30kOhm, electronically balanced
Maximum Input Level
+14dBu
Input Gain
-30 / +6 dB variable in 0.5 dB steps
Connectors
4 x XLR-M
Output Impedance
600 Ohms, electronically balanced
Nominal Output Level
0 dBu
Maximum Output Level
+14 dBu
Output Gain
-30 / +6 dB variable in 0.5 dB steps
Minimum Total Delay Time
1.224mS
A/D converters
20 bit
D/A converters
24 bit
Internal dynamics
40 bit
Sampling frequency
48 kHz
Configuration
2-WAY STEREO, 2,3,4-WAY MONO
Crossover Filters Type
Bessel, Butterworth or Linkwitz-Riley
Crossover Filters Slope
6, 12, 18, 24, or 48dB per octave
Delay Step
21 microseconds minimum
Max Delay time
582 ms (inputs), 189 ms (outputs)
EQ filters
Up to 30 maximum (depending on the crossover slope)
EQ Type
Peak, 6dB Lo-Shelf, 12dB Lo-Shelf, 6dB Hi-Shelf, 12dB Lo-Shelf, Notch
EQ Gain
+/15dB, variable in 0.5dB steps
EQ Bandwidth
0.05 to 3.00 octaves, variable in 0.05 steps
EQ freq
15.6 Hz to 16 kHz
Dynamics
Digital limiter on all the outputs
Memories
17 FACTORY PRESETS + 64 USER PRESETS
MIDI
MIDI IN/THRU/OUT
Frequency Response
20Hz - 20kHz, ±0.25dB
Dynamic range
>102dB 20Hz to 20kHz
Channel Separation
>100dB 20Hz to 20kHz
Distortion (THD)
0.06%, 20Hz to 20kHz
Input Metering
-24dB, -18dB, -12dB, -6dB, CLIP relative to Clip point (+14dBu)
Output Metering
-24dB, -12dB, -6dB, LIMIT relative to limiter threshold setting, CLIP
Dimensions
483x44x300 mm
Weight
4.0 Kg
Power supply
see label on the unit
General
DSP Section
INPUT section
DX 24 • TECHNICAL SPECIFICATIONS
Output Section
Features
General Performance (with filters out)

33
33
3
Testing procedureTesting procedure
Testing procedureTesting procedure
Testing procedure
Instruments requiredInstruments required
Instruments requiredInstruments required
Instruments required
1) Sinusoidal signal generator
2) Dual trace scope
3) Digital multimeter
VV
VV
Visual checkisual check
isual checkisual check
isual check
Check the internal cables and sockets for possible interruptions
or shorts, also check the DC output voltages of the Switching
Supply Unit disconnecting its output connector, if appears a
damage don't try to repair it but replace the unit with a new one.
SetupSetup
SetupSetup
Setup
Switch off the unit.
Connect the signal generator to the IN A XLR socket, and set it
at 1KHz, 0.775V1KHz, 0.775V
1KHz, 0.775V1KHz, 0.775V
1KHz, 0.775VRMSRMS
RMSRMS
RMS (0dBu)(0dBu)
(0dBu)(0dBu)
(0dBu)
Connect the digital multimeter to the OUT 1 XLR socket, and set
in dBu scale.
Connect the scope CH1 probe tip to the pin 2 - OUT 1 socket and
the CH2 probe tip to the pin 2 - OUT 3 socket, a single gnd clip
must be connected to a socket ground (pin1).
Note: If you use a balanced signal generator you have to check
a balanced output signal level, or if you use an unbalanced signal
generator you have to check an unbalanced output signal level,
in this last case you have to check always the negative signal
circuitry in either pin 3 of XLR input and output sockets, refer to
schematics.
Control Panel TestControl Panel Test
Control Panel TestControl Panel Test
Control Panel Test
Press and hold the MUTE 3MUTE 3
MUTE 3MUTE 3
MUTE 3 and MUTE 4MUTE 4
MUTE 4MUTE 4
MUTE 4 buttons while switch on
the unit, a semi-automatic test starts and goes on with the
following steps:
1- Leds must switch on sequentially.
2- Press the MODE button, the display shows KEY 1.
3- Press the PREV button, the display shows KEY 2.
4- Press the LEFT button, the display shows KEY 3.
5- Press the NEXT button, the display shows KEY 4.
6- Press the RIGHT button, the display shows KEY 5.
7- Press the ENTER button, the display shows KEY 6.
8- Press the ESC button, the display shows KEY 7.
9- Press the MUTE 1 button, the display shows KEY 8.
10- Press the MUTE 2 button, the display shows KEY 9.
11- Press the MUTE 3 button, the display shows KEY 10.
12- Press the MUTE 4 button, the display shows KEY 11.
13- Turning the DIAL encoder clockwise the numbers at the right
of DIAL text on the display increase, turning counterclockwise
decrease.
MIDI testMIDI test
MIDI testMIDI test
MIDI test
Establish a loop connecting a MIDI cable between MIDI IN and
MIDI OUT sockets, the display shows the number 85 at the right
of MIDI text.
IN A testIN A test
IN A testIN A test
IN A test
Check the OUT 1 level: it must be within 0±0.5dBu (775±50mVRMS).
Check the OUT 3 level: it must be within 0±0.5dBu (775±50mVRMS).
Sweeping the generator frequency from 20 to 20KHz no level
changes must be detectable.
IN B testIN B test
IN B testIN B test
IN B test
Move the instruments connections to IN B and OUT 2 and 4
respectively.
Check the OUT 2 level: it must be within 0±0.5dBu (775±50mVRMS).
Check the OUT 4 level: it must be within 0±0.5dBu (775±50mVRMS).
Sweeping the generator frequency from 20 to 20KHz no level
changes must be detectable.
RESET MEMORYRESET MEMORY
RESET MEMORYRESET MEMORY
RESET MEMORY
Switch off the unit.
Press and hold the PREV and LEFT buttons while switch on the
unit, the display shows INITIALIZING ALL MEMORY.
O.S. Release & DX-editorO.S. Release & DX-editor
O.S. Release & DX-editorO.S. Release & DX-editor
O.S. Release & DX-editor
The DX-editor program permits to edit the DX24 loudspeaker
processor parameters remotely using a notebook PC-Windows
based computer, via a MIDI interface; let up to 32 DX24
processors must be controlled remotely.
DX-editor can be downloaded free from LEM website (http://
www.lemaudio.com).
To use the DX-editor, your DX24 unit must have an O.S. Release
at least 2.0 or upper.
The O.S. Release appears on display while you turn on the unit.
If you want to upgrade your unit you have to replace the
"550686 - Firmware" eprom in IC13 position with a new one with
the lastest contents, this eprom may be ordered from
Generalmusic.

44
44
4

55
55
5

66
66
6
1156
157
208
RED QFP208
Package pin-out
52
53 104
105
G.BOCCATO
G.RICCI
F.GAZZILLI
550722 313069/1
DX24
22/03/01
A
CPU & AD/DA PCB LAYOUT

77
77
7
G.BOCCATO
G.RICCI
F.GAZZILLI
550723 313070/313073/313074
DX24
22/03/01
A
I/O & CONTROLS PCB LAYOUT

88
88
8
Spare Part ListSpare Part List
Spare Part ListSpare Part List
Spare Part List
LegendLegend
LegendLegend
Legend
EU = Europe Version 230Vac
US = United States Version 115Vac
Code Description
AccessoriesAccessories
AccessoriesAccessories
Accessories
277349 Owner’s Manual (Italian-English)
130297 Mains Cable (EU)
130283 Mains Cable (US)
AssemblyAssembly
AssemblyAssembly
Assembly
667731 Cover
667729 Chassis
667728 Front Panel
657279 Display Screen
657277 Meters Screen
347060 Nylon Cable Tie with 3mm Eye
340961 Encoder Knob
340186 Adhesive Cable Fixing
340078 TO220 Insulated Bush
210215 Adhesive Rubber Foam 10x1.9mm (Specify mt)
190234 100X130X0.4mm Lateroid Insulator
150298 100x2.5mm Nylon Cable Tie
120827 10mm Threaded Spacer
120582 M3 Black Nut
120481 3mm Black Shakeproof Washer
120467 4.2x10x0.5 Nylon Washer
120276 B2.9x6.5mm Screw
120029 M3x6tc Black Screw
120025 M3x10tsp Black Screw
120005 M3x10tc Screw
Mains SupplyMains Supply
Mains SupplyMains Supply
Mains Supply
110614 Mains Socket
110285 4A 250Vac Bipolar Power Switch
731011731011
731011731011
731011 SNP9541M 40W Switching Supply UnitSNP9541M 40W Switching Supply Unit
SNP9541M 40W Switching Supply UnitSNP9541M 40W Switching Supply Unit
SNP9541M 40W Switching Supply Unit
Controls Panel AssemblyControls Panel Assembly
Controls Panel AssemblyControls Panel Assembly
Controls Panel Assembly
768245768245
768245768245
768245 2x16 Characters Lcd Module2x16 Characters Lcd Module
2x16 Characters Lcd Module2x16 Characters Lcd Module
2x16 Characters Lcd Module
140860 * 14 Contacts Vert Male Dual In Line Strip
080757 * WM-C1602N-2GLYC Wintek 2x16 Characters Lcd Display
768244768244
768244768244
768244 Led & Meters Board (Pcb#313074)Led & Meters Board (Pcb#313074)
Led & Meters Board (Pcb#313074)Led & Meters Board (Pcb#313074)
Led & Meters Board (Pcb#313074)
140874 * Single In Line Vert Male Strip (specify contacts)
103028 * 74HC4094M1R SOIC 8bit Shift/Latch Register
081702 * Led Smd Yellow
081701 * Led Smd Green
081700 * Led Smd Red
054037 * 1K2 1/10w 5% Smd Resistor 0805
054012 * 10E 1/10w 5% Smd Resistor 0805
011060 * 100n 50V 10% Cer. Cap. Smd CL2 Y5V 0805
768243768243
768243768243
768243 Controls Panel Board (Pcb#313073)Controls Panel Board (Pcb#313073)
Controls Panel Board (Pcb#313073)Controls Panel Board (Pcb#313073)
Controls Panel Board (Pcb#313073)
841268 * 14 Wires 15cm Latch/Transition Flat Cable
340856 * 6,4mm Led Spacer
141018 * 20 Contacts Vert Female Connector
141015 * 14 Contacts Vert Female Connector
140918 * 2 Contacts Hor Male Connector
140529 * Microswitch 12V 50mA 0.25mm
110261 * Dial Encoder with 30 Snap H=15mm Alps
103032 * 74HC165D SOIC 8bit P To S Shift Register
103028 * 74HC4094M1R SOIC 8bit Shift/Latch Register
103010 * 74HC04D SOIC Hex Inverter
103000 * 74HC14D Soic Hex Inverter Schmitt Trigger
081000 * PMLL4148 Smd 100mA 75V Signal Diode
080705 * 3mm 60deg Diffused Red Led
055101 * 4K7 X4 1/16w 5% Smd Resistor Array
054060 * 100K 1/10w 5% Smd Resistor 0805
054048 * 10K 1/10w 5% Smd Resistor 0805
054045 * 5K6 1/10w 5% Smd Resistor 0805
054043 * 3K9 1/10w 5% Smd Resistor 0805
054037 * 1K2 1/10w 5% Smd Resistor 0805
054036 * 1K 1/10w 5% Smd Resistor 0805
040091 * 4E7 1/2W 5% Resistor
030565 * 220u 25V 20% Vert Electrolytic Capacitor
030246 * 10u 25V 20% Low Prof Vert Electrolytic Capacitor
011060 * 100n 50V 10% Cer. Cap. Smd CL2 Y5V 0805
011048 * 10n 50V 10% Cer. Cap. Smd CL2 X7R 0805
011020 * 47p 50V 10% Cer. Cap. Smd CL2 X7R 0805
347394 Rubber Switch Actuator
120579 M2 Nut
120021 M2x6tc Screw
Cpu/Dsp & AD/DA BoardCpu/Dsp & AD/DA Board
Cpu/Dsp & AD/DA BoardCpu/Dsp & AD/DA Board
Cpu/Dsp & AD/DA Board
768226768226
768226768226
768226 Cpu/Dsp & AD/DA Board (Pcb#313069)Cpu/Dsp & AD/DA Board (Pcb#313069)
Cpu/Dsp & AD/DA Board (Pcb#313069)Cpu/Dsp & AD/DA Board (Pcb#313069)
Cpu/Dsp & AD/DA Board (Pcb#313069)
550686 * 27C4001D Eprom 4mbit “DX24 Firmware”
250524 * 25x25mm Thermoconductor Adhesive
231000 * BLM21A102STP Smd EMI Coil For Signal
177690 * Heatsink
171039 * Ground Leaf
141018 * 20 Contacts Vert Female Connector
141015 * 14 Contacts Vert Female Connector
141012 * 8 Contacts Vert Female Connector
141010 * 4 Contacts Vert Female Connector
140908 * 6 Contacts Vert Male Small Connector
140606 * DIL32 Socket
130175 * AWG18 Green Cable
120276 * B2.9x6.5mm Screw
106003 * MAX709 Power Monitor With Reset
106001 * MC33078P SOIC Dual Low Noise Op. Amp.
105008 * RED208 Risc Cpu and Dsp
104052 * AT24C64 64Kbit Serial Access EEProm
104003 * HM514260JP SOJ 4Mbit Dynamic Ram Ta=70ns
103043 * PCM1716 24 Bit Stereo Dac
103042 * PCM1800 20 Bit Stereo Adc
103010 * 74HC04D SOIC Hex Inverter
103007 * 74HC74D SOIC Dual Flip-Flop
103000 * 74HC14D Soic Hex Inverter Schmitt Trigger
090856 * J176 TO92 P-Channel J-Fet Transistor
081000 * PMLL4148 Smd 100mA 75V Signal Diode
055103 * 470E X4 1/16w 5% Smd Resistor Array
055102 * 33E X4 1/16w 5% Smd Resistor Array
055101 * 4K7 X4 1/16w 5% Smd Resistor Array
055100 * 100E X4 1/16w 5% Smd Resistor Array
054064 * 220K 1/10w 5% Smd Resistor 0805
054056 * 47K 1/10w 5% Smd Resistor 0805
054054 * 33K 1/10w 5% Smd Resistor 0805
054048 * 10K 1/10w 5% Smd Resistor 0805
054044 * 4K7 1/10w 5% Smd Resistor 0805
054039 * 1K8 1/10w 5% Smd Resistor 0805
054038 * 1K5 1/10w 5% Smd Resistor 0805
054035 * 820E 1/10w 5% Smd Resistor 0805
054033 * 560E 1/10w 5% Smd Resistor 0805
054032 * 470E 1/10w 5% Smd Resistor 0805
054028 * 220E 1/10w 5% Smd Resistor 0805
054024 * 100E 1/10w 5% Smd Resistor 0805
054020 * 47E 1/10w 5% Smd Resistor 0805
054012 * 10E 1/10w 5% Smd Resistor 0805
042605 * 10K0 1/4W 1% Metalized Film Resistor
042260 * 0E 1/4W Resistor
031007 * 10u 16V 20% Smd Electrolytic Tantalium Capacitor
030715 * 1000u 6v3 20% Vert Electrolytic Capacitor
030485 * 100u 25V 20% Vert Electrolytic Capacitor
011103 * 1u 16V 10% Cer. Cap. Smd CL2 XTR 1206
011060 * 100n 50V 10% Cer. Cap. Smd CL2 Y5V 0805
011032 * 470p 50V 10% Cer. Cap. Smd CL2 X7R 0805
011020 * 47p 50V 10% Cer. Cap. Smd CL2 X7R 0805
011014 * 15p 50V 10% Cer. Cap. Smd CL2 X7R 0805
010722 * 24.576MHz Quartz Resonator
In/Out BoardIn/Out Board
In/Out BoardIn/Out Board
In/Out Board
768231768231
768231768231
768231 In/Out Board (Pcb#313070)In/Out Board (Pcb#313070)
In/Out Board (Pcb#313070)In/Out Board (Pcb#313070)
In/Out Board (Pcb#313070)
230569 * FL5R200PNT EMI Coil For Signal
141187 * Hor Female XLR Socket (NC3FAH Neutrik)
141186 * Hor Male XLR Socket (NC3MAH Neutrik)
141102 * 6 Contacts Vert Male Connector
141012 * 8 Contacts Vert Female Connector
141010 * 4 Contacts Vert Female Connector
140918 * 2 Contacts Hor Male Connector
140908 * 6 Contacts Vert Male Small Connector
140212 * 5 Poles Din Horizontal Female Socket
120857 * 6.3mm Vertical Male Faston for Pcb
100919 * MC33078 Dual LN Operational Amplifier
100602 * 74HC04 Hex Inverter
100035 * 6N138 Optocoupler
080103 * 1N4148 100mA 75V Signal Diode
052048 * 10K 1/8w 5% Resistor
052044 * 4K7 1/8w 5% Resistor
052028 * 220E 1/8w 5% Resistor
052022 * 68E 1/8w 5% Resistor
042672 * 39K2 1/4W 1% Metalized Film Resistor
042632 * 18K2 1/4W 1% Metalized Film Resistor
042625 * 15K0 1/4W 1% Metalized Film Resistor
042611 * 11K5 1/4W 1% Metalized Film Resistor
042605 * 10K0 1/4W 1% Metalized Film Resistor
042524 * 2K43 1/4W 1% Metalized Film Resistor
042425 * 332E 1/4W 1% Metalized Film Resistor
042345 * 75E0 1/4W 1% Metalized Film Resistor
030858 * 4700uF 25V 20% Vert Electrolytic Capacitor
030403 * 47u 25V 20% Vert Electrolytic Capacitor
022002 * 1n5 2.5% 100V MKP Polypropylene Capacitor
010595 * 100n 50V -20+80% Ceramic Cap. Multilayer
010304 * 47p 50V 10% CL2 Ceramic Capacitor
010271 * 22p 50V 10% CL2 Ceramic Capacitor
Wiring ConnectionsWiring Connections
Wiring ConnectionsWiring Connections
Wiring Connections
841271 27.5cm Yel/Grn Eye/Faston/Faston Wire with 10E Res
841270 Single 12.5cm AWG18 White Faston/Faston Wire
841269 2 Wires 40cm Faston/Crimp Terminal Cable
841264 6 AWG18 Wires 10cm Crimp Terminal Cable
841263 8 Wires 3cm Flat Cable
841252 6 Wires 12.5cm Crimp Terminal Cable
841206 4 Wires 20cm Flat Cable
841005 7.5cm Yel/Grn Faston/Faston AWG18 Wire
840838 20 Wires 15cm Flat Cable
840826 14 Wires 15cm Flat Cable
840799 4 Wires 7.5cm Flat Cable
840776 2 Wires 25cm Crimp Terminal Cable
Note:Note:
Note:Note:
Note:
- All dimensions are in mm unless otherwise specified.
- The screw description is defined as follows:
type of screw + diameter + X + length + type of head
where type of screw is one of these:
M = Metric thread
B = Self-tapping screw for metal
WL = Self-tapping screw for wood
and type of head is one of these:
tc = cylinder Phillips head
ts = flared Phillips head
tt = rounded Phillips head
te = hexagonal nut head
tsp = flat flared Phillips head
tce = cylinder Allen hexagonal head
tspe = flat flared Allen hexagonal head
- The washer description is defined as follow:
hole diameter + X + external diameter + X + thick
- Each spare part is single quantity unless otherwise specified.
- Asterisk prefix explanation:
Omitted = First level spare part.
One asterisk = Second level, part of previous listed first level part.
Two asterisk = Third level, part of previous listed second level part.
Three asterisk = ............
- Any request for not above mentioned part must encompass specific description including:
1) Model name,
2) Section name,
3) Module code,
4) Reference name,
5) Quantity number.